Method and means for measuring the frequency of a periodic signa

Details Method and means for measuring the frequency of a periodic signa Method and means for measuring the frequency of a periodic signa

1988-09-20

1989-09-12

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 78F, G01R 2302

Patent

active

048662607

ABSTRACT:
Frequency measurement involves anti-foldover filtering (1) of an analog signal whose frequency i.e. to be measured, followed by sampling of the filtered analog signal and analog-digital conversion of the samples, then digital band-pass filtering (3) on a slaved basis. Associated calculation (4-7) utilizes a linear regression having a single coefficient a for the linear relation between successive digitized samples (2) and to estimate the coefficient a for approximation of the frequency to be measured. The invention is particularly applicable to signals from a probe having nuclear magnetic resonance used in measuring intensity of the terrestrial magnetic field disturbed by metallic masses.

REFERENCES:
patent: 3978416 (1976-08-01), Sutphin, Jr.
patent: 3986112 (1976-10-01), Hamilton
patent: 4057756 (1977-11-01), Ley et al.

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